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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f33d14ad7f15e9c00c4d9cce5ec0b93b71c6bfc0f962f986829a31ab84f776f' 
  AND token = 'da+r5aXK1Xx0L8KOqEJGn4yB5tAjlNaGpj5XdLHm1Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}